Mussel-Inspired Self-Adhesive, Antidrying, and Antifreezing Poly(acrylic acid)/Bentonite/Polydopamine Hybrid Glycerol-Hydrogel and the Sensing Application

Abstract

Hydrogel has great application prospect in the field of flexible wearable devices; however, its poor antifreezing and antidrying properties hinder its applications in wearable devices. Herein, a self-adhesive glycerol-hydrogel (G-hydrogel) with antifreezing and antidrying properties was prepared successfully. The glycerol and water double-solvent system endowed excellent antifreezing and antidrying properties with hydrogel, which ensured the flexibility of the G-hydrogel even after being frozen for 24 h at −15 °C or stored at room temperature for a long time. Polydopamine (PDA)-intercalated bentonite (BT) incorporated into the G-hydrogel contributed good comprehensive mechanical property to the G-hydrogel. The peeling test results confirmed that G-hydrogel has good adhesion to natural and synthetic materials because of the existence of PDA with catechol structure. Particularly, the G-hydrogel presented marvelous sensing capabilities for strain and pressure and could monitor the movements of a human. In summary, this kind of self-adhesive, antidrying, and antifreezing hybrid G-hydrogel may be a very promising soft material for flexible wearable devices.

Highly Stretchable, Elastic, Healable, and Ultra-Durable Polyvinyl Alcohol-Based Ionic Conductors Capable of Safe Disposal

“…Figure 3e shows the stretchability and durability of the recently reported hydrogel-, organohydrogel-and ionogel-based ionic conductors. [10][11][12][13][14][19][20][21][24][25][26][27][28][29][30][31]34,35,[49][50][51][52][53][54][55][56][57][58] Our VPVA 40% -IL ionic conductors are at record levels in terms of their stretchability and durability, demonstrating their considerable potential for use in flexible electronics and devices.…”

Highly Transparent, Self-Healing, and Self-Adhesive Double Network Hydrogel for Wearable Sensors

“…The self-adhesive hydrogel can establish a stable and reliable interface with the measured target and improve the detection of weak and physiological signals (Jin et al, 2021). Wu et al constructed a mussel-inspired PDA/BT/PAA glycerol-hydrogel (G-hydrogel), which exhibited wonderful self-adhesive performances (adhesion strength to porcine skin of 18 kPa) (Wu et al, 2020). Therefore, we tend to find solution from the double network hydrogel system with outstanding mechanical properties.…”

Mussel‐inspired chitosan‐based hydrogel sensor with pH‐responsive and adjustable adhesion, toughness and self‐healing capability

“…However, these bioelectronic devices usually have low adhesion without external assistance. The conformal contact between the bioelectronic devices and the tissue are usually obtained and maintained by the bandages, scotch tapes, and adhesives, 14 which caused the interface resistance between the devices and the target tissue to be relatively large. Therefore, the hydrogel bioelectronic device with excellent adhesion without external assistance is urgently to be prepared.…”